This map has bizarre features such as a shadow and negative area. Try digging down in the shadow biome and try going up from the negative biome! The Old Man in the dungeon has been hiding something in the room where he is always pacing around. Extra weird areas like the Mutated Sakura Tree, Dungeon Tree, Dungeon Beehive, Lava Sky Lake and Honey Sky Lake. On the right ocean, lies a huge shell pile.
This Map is harder because it also has a pre-hardmode Hallowed Biome on the surface and also 2 surface mushroom biomes.
There may be extra things I have not listed but that is for you to explore >:D.
DISCLAIMER !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Official Journey Version of this Map:
https://www.curseforge.com/terraria/maps/journey-twisted-world
DO NOT DOWNLOAD THIS MAP FROM ANY OTHER SITES OTHER THAN CURSE FORGE.